Sling



FIG. 1 is a front right upper isometric view of a sling.

FIG. 2 is a front view of the sling.

FIG. 3 is a right view of the sling.

FIG. 4 is a left view of the sling.

FIG. 5 is a back view of the sling; and,

FIG. 6 is a top view of the sling.

The broken lines illustrate portions of the sling that form no part of the claimed design. 

CLAIM We claim the ornamental design for a sling, as shown and described. 